2 * EIGRP Interface Functions.
3 * Copyright (C) 2013-2016
15 * This file is part of GNU Zebra.
17 * GNU Zebra is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2, or (at your option) any
22 * GNU Zebra is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License along
28 * with this program; see the file COPYING; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
46 #include "eigrpd/eigrp_structs.h"
47 #include "eigrpd/eigrpd.h"
48 #include "eigrpd/eigrp_interface.h"
49 #include "eigrpd/eigrp_neighbor.h"
50 #include "eigrpd/eigrp_packet.h"
51 #include "eigrpd/eigrp_zebra.h"
52 #include "eigrpd/eigrp_vty.h"
53 #include "eigrpd/eigrp_network.h"
54 #include "eigrpd/eigrp_topology.h"
55 #include "eigrpd/eigrp_memory.h"
56 #include "eigrpd/eigrp_fsm.h"
57 #include "eigrpd/eigrp_dump.h"
59 struct eigrp_interface
*eigrp_if_new(struct eigrp
*eigrp
, struct interface
*ifp
,
62 struct eigrp_interface
*ei
= ifp
->info
;
68 ei
= XCALLOC(MTYPE_EIGRP_IF
, sizeof(struct eigrp_interface
));
70 /* Set zebra interface pointer. */
72 prefix_copy(&ei
->address
, p
);
75 listnode_add(eigrp
->eiflist
, ei
);
77 ei
->type
= EIGRP_IFTYPE_BROADCAST
;
79 /* Initialize neighbor list. */
80 ei
->nbrs
= list_new();
82 ei
->crypt_seqnum
= time(NULL
);
84 /* Initialize lists */
85 for (i
= 0; i
< EIGRP_FILTER_MAX
; i
++) {
88 ei
->routemap
[i
] = NULL
;
93 ei
->params
.v_hello
= EIGRP_HELLO_INTERVAL_DEFAULT
;
94 ei
->params
.v_wait
= EIGRP_HOLD_INTERVAL_DEFAULT
;
95 ei
->params
.bandwidth
= EIGRP_BANDWIDTH_DEFAULT
;
96 ei
->params
.delay
= EIGRP_DELAY_DEFAULT
;
97 ei
->params
.reliability
= EIGRP_RELIABILITY_DEFAULT
;
98 ei
->params
.load
= EIGRP_LOAD_DEFAULT
;
99 ei
->params
.auth_type
= EIGRP_AUTH_TYPE_NONE
;
100 ei
->params
.auth_keychain
= NULL
;
105 int eigrp_if_delete_hook(struct interface
*ifp
)
107 struct eigrp_interface
*ei
= ifp
->info
;
113 list_delete(&ei
->nbrs
);
116 listnode_delete(eigrp
->eiflist
, ei
);
118 eigrp_fifo_free(ei
->obuf
);
120 XFREE(MTYPE_EIGRP_IF_INFO
, ifp
->info
);
126 static int eigrp_ifp_create(struct interface
*ifp
)
128 struct eigrp_interface
*ei
= ifp
->info
;
133 ei
->params
.type
= eigrp_default_iftype(ifp
);
135 eigrp_if_update(ifp
);
140 static int eigrp_ifp_up(struct interface
*ifp
)
142 /* Interface is already up. */
143 if (if_is_operative(ifp
)) {
144 /* Temporarily keep ifp values. */
145 struct interface if_tmp
;
146 memcpy(&if_tmp
, ifp
, sizeof(struct interface
));
148 if (IS_DEBUG_EIGRP(zebra
, ZEBRA_INTERFACE
))
149 zlog_debug("Zebra: Interface[%s] state update.",
152 if (if_tmp
.bandwidth
!= ifp
->bandwidth
) {
153 if (IS_DEBUG_EIGRP(zebra
, ZEBRA_INTERFACE
))
155 "Zebra: Interface[%s] bandwidth change %d -> %d.",
156 ifp
->name
, if_tmp
.bandwidth
,
159 // eigrp_if_recalculate_output_cost (ifp);
162 if (if_tmp
.mtu
!= ifp
->mtu
) {
163 if (IS_DEBUG_EIGRP(zebra
, ZEBRA_INTERFACE
))
165 "Zebra: Interface[%s] MTU change %u -> %u.",
166 ifp
->name
, if_tmp
.mtu
, ifp
->mtu
);
168 /* Must reset the interface (simulate down/up) when MTU
175 if (IS_DEBUG_EIGRP(zebra
, ZEBRA_INTERFACE
))
176 zlog_debug("Zebra: Interface[%s] state change to up.",
180 eigrp_if_up(ifp
->info
);
185 static int eigrp_ifp_down(struct interface
*ifp
)
190 static int eigrp_ifp_destroy(struct interface
*ifp
)
195 struct list
*eigrp_iflist
;
197 void eigrp_if_init(void)
199 if_zapi_callbacks(eigrp_ifp_create
, eigrp_ifp_up
,
200 eigrp_ifp_down
, eigrp_ifp_destroy
);
201 /* Initialize Zebra interface data structure. */
202 // hook_register_prio(if_add, 0, eigrp_if_new);
203 hook_register_prio(if_del
, 0, eigrp_if_delete_hook
);
207 void eigrp_del_if_params(struct eigrp_if_params
*eip
)
209 if (eip
->auth_keychain
)
210 free(eip
->auth_keychain
);
213 int eigrp_if_up(struct eigrp_interface
*ei
)
215 struct eigrp_prefix_entry
*pe
;
216 struct eigrp_nexthop_entry
*ne
;
217 struct eigrp_metrics metric
;
218 struct eigrp_interface
*ei2
;
219 struct listnode
*node
, *nnode
;
226 eigrp_adjust_sndbuflen(eigrp
, ei
->ifp
->mtu
);
228 eigrp_if_stream_set(ei
);
230 /* Set multicast memberships appropriately for new state. */
231 eigrp_if_set_multicast(ei
);
233 thread_add_event(master
, eigrp_hello_timer
, ei
, (1), NULL
);
236 metric
.bandwidth
= eigrp_bandwidth_to_scaled(ei
->params
.bandwidth
);
237 metric
.delay
= eigrp_delay_to_scaled(ei
->params
.delay
);
238 metric
.load
= ei
->params
.load
;
239 metric
.reliability
= ei
->params
.reliability
;
240 metric
.mtu
[0] = 0xDC;
241 metric
.mtu
[1] = 0x05;
242 metric
.mtu
[2] = 0x00;
243 metric
.hop_count
= 0;
247 /*Add connected entry to topology table*/
249 ne
= eigrp_nexthop_entry_new();
251 ne
->reported_metric
= metric
;
252 ne
->total_metric
= metric
;
253 ne
->distance
= eigrp_calculate_metrics(eigrp
, metric
);
254 ne
->reported_distance
= 0;
255 ne
->adv_router
= eigrp
->neighbor_self
;
256 ne
->flags
= EIGRP_NEXTHOP_ENTRY_SUCCESSOR_FLAG
;
258 struct prefix dest_addr
;
260 dest_addr
= ei
->address
;
261 apply_mask(&dest_addr
);
262 pe
= eigrp_topology_table_lookup_ipv4(eigrp
->topology_table
,
266 pe
= eigrp_prefix_entry_new();
267 pe
->serno
= eigrp
->serno
;
268 pe
->destination
= (struct prefix
*)prefix_ipv4_new();
269 prefix_copy(pe
->destination
, &dest_addr
);
271 pe
->nt
= EIGRP_TOPOLOGY_TYPE_CONNECTED
;
274 pe
->reported_metric
= metric
;
275 pe
->state
= EIGRP_FSM_STATE_PASSIVE
;
276 pe
->fdistance
= eigrp_calculate_metrics(eigrp
, metric
);
277 pe
->req_action
|= EIGRP_FSM_NEED_UPDATE
;
278 eigrp_prefix_entry_add(eigrp
->topology_table
, pe
);
279 listnode_add(eigrp
->topology_changes_internalIPV4
, pe
);
281 eigrp_nexthop_entry_add(eigrp
, pe
, ne
);
283 for (ALL_LIST_ELEMENTS(eigrp
->eiflist
, node
, nnode
, ei2
)) {
284 eigrp_update_send(ei2
);
287 pe
->req_action
&= ~EIGRP_FSM_NEED_UPDATE
;
288 listnode_delete(eigrp
->topology_changes_internalIPV4
, pe
);
290 struct eigrp_fsm_action_message msg
;
293 eigrp_nexthop_entry_add(eigrp
, pe
, ne
);
295 msg
.packet_type
= EIGRP_OPC_UPDATE
;
297 msg
.data_type
= EIGRP_CONNECTED
;
298 msg
.adv_router
= NULL
;
302 eigrp_fsm_event(&msg
);
308 int eigrp_if_down(struct eigrp_interface
*ei
)
310 struct listnode
*node
, *nnode
;
311 struct eigrp_neighbor
*nbr
;
316 /* Shutdown packet reception and sending */
318 THREAD_OFF(ei
->t_hello
);
320 eigrp_if_stream_unset(ei
);
322 /*Set infinite metrics to routes learned by this interface and start
324 for (ALL_LIST_ELEMENTS(ei
->nbrs
, node
, nnode
, nbr
)) {
325 eigrp_nbr_delete(nbr
);
331 void eigrp_if_stream_set(struct eigrp_interface
*ei
)
333 /* set output fifo queue. */
334 if (ei
->obuf
== NULL
)
335 ei
->obuf
= eigrp_fifo_new();
338 void eigrp_if_stream_unset(struct eigrp_interface
*ei
)
340 struct eigrp
*eigrp
= ei
->eigrp
;
342 if (ei
->on_write_q
) {
343 listnode_delete(eigrp
->oi_write_q
, ei
);
344 if (list_isempty(eigrp
->oi_write_q
))
345 thread_cancel(eigrp
->t_write
);
350 bool eigrp_if_is_passive(struct eigrp_interface
*ei
)
352 if (ei
->params
.passive_interface
== EIGRP_IF_ACTIVE
)
355 if (ei
->eigrp
->passive_interface_default
== EIGRP_IF_ACTIVE
)
361 void eigrp_if_set_multicast(struct eigrp_interface
*ei
)
363 if (!eigrp_if_is_passive(ei
)) {
364 /* The interface should belong to the EIGRP-all-routers group.
366 if (!ei
->member_allrouters
367 && (eigrp_if_add_allspfrouters(ei
->eigrp
, &ei
->address
,
370 /* Set the flag only if the system call to join
372 ei
->member_allrouters
= true;
374 /* The interface should NOT belong to the EIGRP-all-routers
376 if (ei
->member_allrouters
) {
377 /* Only actually drop if this is the last reference */
378 eigrp_if_drop_allspfrouters(ei
->eigrp
, &ei
->address
,
380 /* Unset the flag regardless of whether the system call
382 the group succeeded, since it's much safer to assume
384 we are not a member. */
385 ei
->member_allrouters
= false;
390 uint8_t eigrp_default_iftype(struct interface
*ifp
)
392 if (if_is_pointopoint(ifp
))
393 return EIGRP_IFTYPE_POINTOPOINT
;
394 else if (if_is_loopback(ifp
))
395 return EIGRP_IFTYPE_LOOPBACK
;
397 return EIGRP_IFTYPE_BROADCAST
;
400 void eigrp_if_free(struct eigrp_interface
*ei
, int source
)
402 struct prefix dest_addr
;
403 struct eigrp_prefix_entry
*pe
;
404 struct eigrp
*eigrp
= ei
->eigrp
;
406 if (source
== INTERFACE_DOWN_BY_VTY
) {
407 THREAD_OFF(ei
->t_hello
);
408 eigrp_hello_send(ei
, EIGRP_HELLO_GRACEFUL_SHUTDOWN
, NULL
);
411 dest_addr
= ei
->address
;
412 apply_mask(&dest_addr
);
413 pe
= eigrp_topology_table_lookup_ipv4(eigrp
->topology_table
,
416 eigrp_prefix_entry_delete(eigrp
, eigrp
->topology_table
, pe
);
420 listnode_delete(ei
->eigrp
->eiflist
, ei
);
423 /* Simulate down/up on the interface. This is needed, for example, when
425 void eigrp_if_reset(struct interface
*ifp
)
427 struct eigrp_interface
*ei
= ifp
->info
;
436 struct eigrp_interface
*eigrp_if_lookup_by_local_addr(struct eigrp
*eigrp
,
437 struct interface
*ifp
,
438 struct in_addr address
)
440 struct listnode
*node
;
441 struct eigrp_interface
*ei
;
443 for (ALL_LIST_ELEMENTS_RO(eigrp
->eiflist
, node
, ei
)) {
444 if (ifp
&& ei
->ifp
!= ifp
)
447 if (IPV4_ADDR_SAME(&address
, &ei
->address
.u
.prefix4
))
455 * @fn eigrp_if_lookup_by_name
457 * @param[in] eigrp EIGRP process
458 * @param[in] if_name Name of the interface
460 * @return struct eigrp_interface *
463 * Function is used for lookup interface by name.
465 struct eigrp_interface
*eigrp_if_lookup_by_name(struct eigrp
*eigrp
,
468 struct eigrp_interface
*ei
;
469 struct listnode
*node
;
471 /* iterate over all eigrp interfaces */
472 for (ALL_LIST_ELEMENTS_RO(eigrp
->eiflist
, node
, ei
)) {
473 /* compare int name with eigrp interface's name */
474 if (strcmp(ei
->ifp
->name
, if_name
) == 0) {
482 uint32_t eigrp_bandwidth_to_scaled(uint32_t bandwidth
)
484 uint64_t temp_bandwidth
= (256ull * 10000000) / bandwidth
;
486 temp_bandwidth
= temp_bandwidth
< EIGRP_MAX_METRIC
? temp_bandwidth
489 return (uint32_t)temp_bandwidth
;
492 uint32_t eigrp_scaled_to_bandwidth(uint32_t scaled
)
494 uint64_t temp_scaled
= scaled
* (256ull * 10000000);
497 temp_scaled
< EIGRP_MAX_METRIC
? temp_scaled
: EIGRP_MAX_METRIC
;
499 return (uint32_t)temp_scaled
;
502 uint32_t eigrp_delay_to_scaled(uint32_t delay
)
507 uint32_t eigrp_scaled_to_delay(uint32_t scaled
)